Pressure_tester

Intake Pressure Tester for 2.7T Engine

Variations in boost production, air/fuel mixture, and drivability can often be traced to leaks in the in-
take system of the 2.7T engine, especially when equipped with larger fuel injectors. Finding and
eliminating leaks makes your 2.7T ownership and any long distance trouble shooting with your tuner
a much better experience.

We came up with an inexpensive method that works like a charm to pressurize the pre-throttle body
side of the intake system of the 2.7T. Feel free to source the parts on your own or you can pur-
chase the entire kit from us for a nominal price. If you want to make your own, we suggest using
www.mcmaster.com as a source for the parts. We have included the part numbers below.

A regulated compressed air source is required to operate this tester. As with all compressed air ap-
plications, take care during operation as the system will be under pressure.

Parts list:

3” rubber straight joining clamp

McMaster # 4511K78

3” PVC cap

McMaster # 9102K223

1 7/8” vinyl cap
McMaster # 9753K86

1 1/4” air coupler, industrial shape
McMaster # 6534K46

1 Hose clamp
McMaster # 5388K18

Tool list:

9/16” box end wrench

31/64” drill bit

Drill

Flat head screwdriver

Regulated compresser air source

Pliers

Using the 31/64” drill bit, drill a hole in the center of the PVC cap.

Thread the air coupler fitting into the cap using the 9/16” box end
wrench. The threads on the fitting will cut into the cap and make an
air tight seal. Thread the fitting down until flush with the cap, as in
Figure 1.

Install the PVC cap into the rubber joining clamp and tighten down the
large hose clamp fully.

Figure 1: Fitting installed in PVC cap

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Installation of the tester requires removal of the
intake hose running between the MAF and Y-pipe
(at point A in Figure 2. AWE RSK04 components
shown in Figure 2, but OEM look similar). Use pli-
ers to unload the springs clamps at each end of the
hose (flathead screwdriver with AWE RSK04 hose).

Remove the side engine covers (removed in Figure
2).

Unclip the PCV damper from Y-pipe (at point B in
Figure 2) by squeezing the clip. Figure 2 shows a
2000 and early 2001 configuration, late 2001 and
2002 will appear similar.

Figure 2: Engine bay

Figure 3: Capping off PCV branch

Close the PCV (Positive Crankcase Ventilation) branch off
the Y-pipe with the vinyl cap and hose clamp. Slip the
hose clamp over the cap and tighten fully.

Figure 3 shows 2000 and early 2001 configuration. Late
2001 and 2002 will appear slightly different.

Remove the oil filler cap, as this will eliminate a hiss noise
as air pressurizes the crankcase during testing.

Figure 4: Tester installed

Slide the rubber clamp assembly over the inlet of the
Y-pipe and tighten down the second large hose
clamp fully.

With air pressure turned off, attach the end of an air
hose to the air fitting on the PVC cap as in Figure 4.

SLOWLY increase the air pressure to the system via
a regulator. No more than 15 psi is needed to ex-
pose any leaks in the system. Be sure to stand clear
in case the tester pops off.

With pressure in the system, listen for any leaks
coming from the intake and fix as needed. Common
leaks are at hose junctions and intercooler end caps.

Any questions or comments, let us know: AWE-Tuning.com 215-658-1670 Page 2 of 2

While this tester pressurizes only the portion of the intake before the throttle body, that is usually
enough to expose any of the common intake leaks that occur on the 2.7T engine.